GB/T 24981.2-2020_English: PDF (GB/T24981.2-2020)
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Test methods of rare earth long afterglow phosphors - Part 2: Determination of afterglow brightness
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GB/T 24981.2-2020
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| GB/T 24981.2-2010 | English | 239 |
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Test methods of long afterglow phosphors activated by rare earths -- Part 2: Determination of relative brightness
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GB/T 24981.2-2010
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| Standard ID | GB/T 24981.2-2020 (GB/T24981.2-2020) | | Description (Translated English) | Test methods of rare earth long afterglow phosphors - Part 2: Determination of afterglow brightness | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H14 | | Classification of International Standard | 77.120.99 | | Word Count Estimation | 5,529 | | Date of Issue | 2020-11-19 | | Date of Implementation | 2021-10-01 | | Older Standard (superseded by this standard) | GB/T 24981.2-2010 | | Drafting Organization | Guangdong Rare Metal Research Institute, Baotou Rare Earth Research Institute, Jiangsu Borui Optoelectronics Co., Ltd., Xiamen University | | Administrative Organization | National Technical Committee for Standardization of Piping Accessories (SAC/TC 237) | | Regulation (derived from) | National Standard Announcement No. 26 of 2020 | | Proposing organization | National Rare Earth Standardization Technical Committee (SAT/TC 229) | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration | | Standard ID | GB/T 24981.2-2010 (GB/T24981.2-2010) | | Description (Translated English) | Test methods of long afterglow phosphors activated by rare earths. Part 2: Determination of relative brightness | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H14 | | Classification of International Standard | 77.120.99 | | Word Count Estimation | 6,624 | | Date of Issue | 2010-08-09 | | Date of Implementation | 2011-05-01 | | Drafting Organization | Dalian Luming Luminescent Technology Corporation | | Administrative Organization | Rare National Standardization Technical Committee | | Regulation (derived from) | National Standard Approval Announcement 2010 No.3 (Total No.158) | | Proposing organization | National Rare Earth Standardization Technical Committee | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, China National Standardization Administration Committee | | Summary | This standard specifies the method for measuring the relative brightness of the rare-earth phosphor afterglow. This section applies to a relatively rare long afterglow phosphor brightness measurement. |
GB/T 24981.2-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.120.99
H 14
Replacing GB/T 24981.2-2010
Test methods of rare earth long afterglow phosphors -
Part 2: Determination of afterglow brightness
ISSUED ON: NOVEMBER 19, 2020
IMPLEMENTED ON: OCTOBER 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Method principle ... 5
3 Terms and definitions ... 5
4 Instruments and devices ... 5
5 Sample preparation ... 6
6 Test procedures ... 6
7 Precision ... 7
Test methods of rare earth long afterglow phosphors -
Part 2: Determination of afterglow brightness
1 Scope
This Part of GB/T 24981 specifies the determination method of afterglow
brightness of rare earth long afterglow phosphors.
This Part applies to the determination of the afterglow brightness of rare earth
long afterglow phosphors.
2 Method principle
Use a light source of a color temperature of 5 500 K ~ 6 500 K as the excitation
light source; use the specified illuminance to directly illuminate the sample.
When the sample is excited and saturated, turn off the excitation light source;
use a luminance meter to measure it; record the brightness value of the
afterglow fluorescence of the sample at the specified time interval, to get the
afterglow brightness of the sample.
3 Terms and definitions
The following terms and definitions are applicable to this document.
3.1
Saturating excitation
The excitation light source is 5 500 K ~ 6 500 K light source (xenon lamp,
fluorescent lamp, LED lamp). Extend the excitation time, and the afterglow
brightness of the phosphor changes within 5%.
4 Instruments and devices
4.1 Illumination test device
The illumination test device shall meet the following conditions:
a) The measurement range is 10 lx ~ 1×105 lx; the accuracy shall meet the
requirements of the national grade-1 illuminometer.
6.1.3 During the measurement process, except for the illumination of the
excitation light source within the specified excitation time, stray light
interference such as visible light or ultraviolet light is not allowed.
6.2 Illumination correction
Turn on the light source and stabilize for 10 min ~ 30 min according to the
requirements of the instrument. Place the photometric probe of the illumination
test device on the sample to be excited; adjust the light source; ensure that the
average illumination illuminating the tested sample is stable at 1 000 lx ± 5 lx or
25 lx ± 0.5 lx.
6.3 Afterglow brightness test
6.3.1 Load the sample into the sample pan; compact and make the surface flat.
6.3.2 Place the sample pan at the place to be excited, so that the sample is
irradiated by the light source to reach a saturated excitation state; the excitation
illumination on the test surface of the sample shall meet the requirements of
4.1c).
6.3.3 Turn off the light source; immediately use the afterglow brightness test
device to test the afterglow brightness of the sample; record the afterglow
brightness values of 10 min, 30 min, and 60 min. If the buyer has special
requirements, the supplier and the buyer shall negotiate and determine.
6.3.4 Do 3 parallel tests; take the arithmetic average. The relative deviation of
the test results shall not exceed 5%.
7 Precision
7.1 Repeatability
For the measured values of the afterglow brightness of two independent tests
that are obtained under repeatability conditions, within the average range given
below, the absolute difference between these two test results does not exceed
the repeatability limit (r); the case of exceeding the repeatability limit (r) is not
more than 5%; the repeatability limit (r) is obtained by linear interpolation
according to the data in Table 1.
Table 1 – Afterglow brightness and repeatability limits of the long
afterglow products
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GB/T 24981.2-2010
Test methods of long afterglow phosphors activated by rare earths Part 2. Determination of relative brightness
ICS 77.120.99
H14
National Standards of People's Republic of China
Test methods of rare earth long afterglow phosphors
Part 2. Determination of relative brightness
Part 2. Determinationofrelativebrightness
Issued on. 2010-08-09
2011-05-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
GB/T 24981 "rare earths long afterglow phosphor Test Method" is divided into two parts.
--- Part 1. Determination of emission peak and chromaticity coordinates;
--- Part 2. Determination of relative brightness.
This is Part 2.
This part of the National Standardization Technical Committee rare and centralized.
This section is responsible for drafting. Dalian Luming Luminescent Technology Co., Ltd.
Participated in the drafting of this section. Shanghai Yuelong New Materials Co., Ltd. Sichuan Sony source, Guangzhou Nonferrous Metal Research
Hospital, Changzhou City Xinyuan Rare Earth Luminescent Materials Co., Ltd., Inner Mongolia Rare Earth days color light-emitting materials limited liability company, Institute of Rare Earth New Material Co.
Limited.
The main drafters of this section. Qu Zhibo, Cao Yingling, Xia Wei, Xiao Zhiguo, Zhang Hongwei, in crystal Jie.
The drafters of some of the participants. Hui-new, Zhang, Nihai Yong, Wang, Liwen Biao, Hu Yunsheng.
Test methods of rare earth long afterglow phosphors
Part 2. Determination of relative brightness
1 Scope
This section GB/T 24981 specifies the method for the determination of rare earth long afterglow phosphor relative brightness.
This section applies to the rare earth long afterglow phosphor relative brightness determination.
2 principle of the method
Xenon lamp as an excitation light source sample illumination direct exposure to regulations, after excitation at a predetermined time to shut down a xenon lamp, by luminance meter
Measurement and recording intervals specified in point afterglow luminance value of the sample fluorescence, the same classification of rare earth photoluminescent (Afterglow) phosphor phase
The luminance value of the luminance national standard sample under the same test conditions compared to obtain the relative brightness of the sample.
3 instruments and apparatus
3.1 illuminance testing device
3.1.1 Measuring range. 10lx ~ 1 × 105lx, light meter accuracy to meet the national requirement level.
3.1.2 Metering sensitive probe of the photosensitive surface diameter. 8mm ~ 12mm.
3.1.3 Illumination. illumination in low light fluorescent powder to be tested anywhere on the surface of the test sample illumination are within 25lx ± 0.5lx range; photos
Shot in the other phosphor samples to be tested anywhere on the test surface illuminance are within 1000lx ± 5lx range.
3.2 emission luminance testing device
3.2.1 Measuring range. 1.0 × 10-5cd/m2 ~ 1.0 × 102cd/m2.
3.2.2 Minimum value display 4-digit precision required to achieve a luminance meter requirements at the national level.
3.2.3 have the ability to test the average luminance of the measured area issued.
3.3 excitation light source
Color temperature 5500K ~ 6500K, color rendering index greater than 95 quartz bulb xenon lamp, ultraviolet B band, A band and even the visible region
Continued spectrum, every 10min light output stability better than 1% throughout the life meet those requirements.
3.4 Sample Tray
Sample tray is black, inner diameter of 45mm ± 5mm, depth of 5mm ± 2mm. Material not affect the spectral characteristics of the excitation light source
And spectroscopic properties of rare earth long afterglow phosphor.
4 sample preparation
4.1 as specified in Table 1, selecting the sample to be tested corresponding rare earth photoluminescent (Afterglow) relative brightness of the phosphor national standard sample.
Table 1
Chemical composition system type test sample phosphors national standard sample number and name brands
Alkaline earth aluminate
Conventional yellow-green earth aluminate
207001A, 207001B, 207001C,
207002A, 207002B, 207002C,
207003A, 207003B
Conventional blue-green earth aluminate
207001D, 207001E,
207002D, 207002E
Particle type yellow-green earth aluminate 207004A, 207004B, 207004C
RE STORING (Afterglow) Phosphor
The relative brightness national standard sample
GSB04-2534-2009
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